Re: JAXP problem

[Edwin Goei <ed...@sun.com>]

Min Lee wrote:
> 
> Hi all,
> 
> I'm having a strange problem with Xerces (1.3.1) and JAXP.  It seems that if
> I use the DOMParser.parse(String) to parse (with validation enabled)
> data/personal-schema.xml, I have no problem.  However, if I parse the same
> file using DocumentBuilder API, it seems the parser cannot find the
> personal.xsd and complains that the elements are not declared.  I've seen
> similar behaviour for SAXParser.
> 
> A snippet of my test program:
> ...
> DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
> dbf.setValidating(true);
> DocumentBuilder db = dbf.newDocumentBuilder();
> Document doc = db.parse(args[0]);
> ...
> 
> and the error, from the default error handler is:
> 
> Error: URI=file:///E:/personal-schema.xml Line=3: Element type "personnel"
> must be declared.
> 
> I've seen this happen 1.4.1 release as well.  Any ideas?  Thanks in advance
> for your help,

OK, my initial evaluation was wrong, sorry.  The problem is that you
need to turn on Namespace processing in the parser with JAXP.  So for
example, before creating the DocumentBuilder, add this line:

dbf.setNamespaceAware(true);

The reason for this is historical.  JAXP 1.0 defined the default value
to be false, then SAX 2.0 came along and defined a "namespaces" feature
with a default of true, then JAXP 1.1 came along and had to maintain
backward compatibility with JAXP 1.0.  The reason it works if you use
Xerces implementation classes directly is because Xerces has a default
value of true.

So to summarize, I think what is going on here is that even though the
XSD file does not use a targetNamespace, the instance document must use
namespaces to point to the XSD file so the parser still needs to have
namespaces turned on.  Hopefully someone will correct me if I am wrong.

-Edwin

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